This is the Project Lyra [1], where a UK-registered not-for-profit company suggest sending a spacecraft to catch-up with ʻOumuamua object that pass thru solar system in 2017, by using orbital mechanic. Spacecraft set off at right window would speed up using gravity assist maneuver [2] around objects in the solar system and save a lot of fuel to hopefully reach 'Oumuamua in 26 years
[1] - https://en.wikipedia.org/wiki/Project_Lyra
[2] - https://vid.pr0gramm.com/2023/12/11/99b60d87a3679fe0-vp9.mp4